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[7,8,17]. The step size was 0.02° and the counting time was 1.5 s. For LPA, a special program was developed to fit every peak by Voigt function. Meanwhile, the instrumental effects were... in particular metals and alloys because of the complex effects from chemical compositions, texture, dislocation characters, annealing treatments and testing methods [19,21,42]. For instance, DAYMOND......
. The alloys were obtained by mechanical alloying in a planetary mill using 100 h of milling (this time was used after previous studies of the research group). In addition, theoretical thermodynamic models...- type). The samples were measured in transmission mode using a step of 0.012° and a stepwise dwelling time of 10 s in an angular range of 2θ=20°-120°. The microstructural information was obtained......
structure. Before extrusion, the larger size and higher volume fraction of DRXed grains obtained in 6MDF270 composite may arise because the recrystallized grains have more time and energy to nucleate... of Mg-8Gd-4Y-1Nd-0.5Zr alloy prepared by pre-deformation annealing, hot compression and ageing [J]. Transactions of Nonferrous Metals Society of China, 2019, 29(5): 976-983. [44] GUO Y C, NIE K B, KANG X K......
. It is found that the increasing of holding time could greatly reduce the springback angles due to the internal stress relaxation. GHEYSARIAN et al [22] found that application of annealing before aging can...) to resolve the poor formability of aluminum alloy and reduce the springback of the part. In this process, the sheet firstly was heated for a certain time. Then, it will be transferred to the cold tool......
is zero-pressure volume) The simulation was subjected to the three- dimensional periodic boundary conditions and a constant time step of 1 fs. After randomly generating the positions and velocities of 16000 atoms in a cubic box, the equilibrium liquid was firstly obtained by relaxing the system for 2×106 time steps (2 ns) at 6000 K (well above the melting point of this potential, Tm=(4100±50......
'' phases can form at short time less than 10 h, while the formation of Laves and δ phases needs prolonged time higher than 20 h. Therefore, as shown in Figs. 5(a-c), Laves and δ phases were... treatment temperatures were almost similar to the optimum conditions reported by MARCHESE et al [28] during heat treatment of Inconel 625 walls fabricated by LPBF, while the solution heat treatment time......
of DRX grain nucleation, is the nucleation rate, K is the number of grains with ρi>ρc, C(T) is a function of temperature, Si is the surface area of grain i, and Δt is the time increment... of Mg-8Gd–4Y–1Nd–0.5Zr alloy prepared by pre-deformation annealing, hot compression and ageing [J]. Transactions of Nonferrous Metals Society of China, 2019, 29(5): 976-983. [10] QIAO J, BIAN F B, HE M......
(0.5 s-1), there is not sufficient time for the dislocation reaction and nucleation of recrystallization and at this strain rate, stress decreases with increasing grain size and temperature... for temperature and time. Consequently, the peak stress increases with increasing strain rate and decreasing temperature [40,41]. It is noteworthy that the flow stress increases with increasing grain size......
is that lower strain rates (0.001 and 0.01 s-1) provide enough time for the dynamic recovery and softening. The normal increase of dislocation density, i.e., working hardening, is counteracted.... Influence of hot working process on microstructure of superalloy GH4586 [J]. Acta Metall Sinica, 2005, 41: 351-356. [14] HUMPHREYS F J, HATHERLY M. Recrystallization and related annealing phenomena [M......
) followed by holding time. Predicted values of the denitrification rate are found to be in good agreement with experimental values (R2=0.9894 and =0.9775), which confirms the validity of the model employed. The optimum conditions of roasting temperature of 750 °C, holding time of 194 min, mass fraction of cryolite of 17.7% are obtained according to the quadratic model. Under these conditions......
